Window-sash fastener



A. 1:. DAVIS.

WINDOW SASH FASTENER.

APPLlCATlON FILED JAN. 14, 1921.

1, g 1, Patented July 18, m2,

' v INVEN 0R.

A TTORNEY.

ALONZO E. DAVIS, OF .ASI-ITABULA, OHIO.

WINDOW-SASl-I FASTENER.

mea re.

Application filed January 14, 1921.

sion of means associated with a self-locking member, for permitting the member to be readily moved from looking position, without effecting undue strain upon the moving parts of the lock.

Other objects include the provision of a locking device which permits a window to be conveniently opened by the person on the inside of a building, while preventing access to thelocking mechanism from the outside thereof.

The means for accomplishing the above objects will-be fully set forth in the following description, which relates to the drawings and the essential characteristics will be set forth in the claims:

In the drawings, Fig. 1 is an elevation of a wall with a window therein, embodying the features of my invention; Fig. 2 is a transverse sect-ion through the window taken on line 2-2 in Fig. 1; Figs. 8 and at are fragmentary sections showing the position of my locking device when the window is opened and closed, respectively; Figs. 5 and 6 are sideand end elevations respectively of a locking pawl, and trigger; Fig. Tie a perspective view showing the springfor urging the pawl against the rack bars.

My invention is shown in the drawings with a window sash. lock of the self-locking type. In Fig. 1, 10 represents the sill, 11.1 the lintel, and 12 and 13 the jambs of a window frame, in which are slidably mounted the upper sash la and the lower sash 15. The upper sash is shown, as provided, with a rack bar 16, having a series of spaced teeth 17. This rack bar is preferably embedded within the styles of the sash 15, while a pawl 18, pivotally mounted at l9, is secured to the top of the lower sash and is adapted to engage the teeth in the rack bar. To support the pawl, I provide a base 20, which Specification of Letters Eatent.

Patented July 18, Serial No. 437,139.

extends across the joint intermediate the upper and lower sashes, and which in addi-' tion to supporting the pawl provides a guard for preventing the entrance of a burglar tool between the sashes. A spring 21 normally urges the pawl into engagement with the rack bar, and is adapted to be securedto the upper sash by means of the supporting base 20.

To move the pawl against the tension in the spring 21 and therefore to disengage it from the rack bar, I provide suitable members in engagement with the pawl and I so positionthese members that they may be conveniently operated whenever it is desired to open the window. In Figs. 5 and 6, this member is shown as having a portion projecting laterally, as at 22, from the pawl 18, and then downwardly as at 23 and terminating in a pad, as at 24. This member is preferably formed integrally with the pawl and the position of the pad is such that the bottommost portion thereof clears the top of the lower sash when the pawl is in engagement with the rack bar. This clearance is suflicient to permit the pawls to be disengaged from the teeth before the pad abuts the sash to limit the movement of the pawl.

Assuming that it is desired to raise the lower window, the operator seizes the top rail of the lower sash with his fingers and presses downwardly on the pad of each lock until the lowermost portion of the pad abuts the sash, whereupon further movement of the pawl is arrested. is held in abutting engagement with the sash,

the window is manually raised to the desired height and the pads released, whereupon the springs 21 again urge the pawls into engagement with the rack bars, and the window is then locked against further opening.

After the lower window has been raised or the upper window has been lowered to a point, wherein the locking pawl is in engage:

Then while the pad ment with the rack bar, then the lock will be rendered inaccessible to persons outside the building, by reason of the fact that it-is necessary to simultaneously depress the pad on each pawl, before the pawls will be disengaged from their respective rack bars.

. Besides the safety feature embodied in a lock having the movable elements thereof equipped, according to my invention, there is a further advantage in that the life of the spring is prolonged. This advantage is obtained by reason of the fact that the spring is permitted to bend only a predetermined amount, which amount is less than the elastic limit thereof.

From the foregoing description, it will be seen that I have provided a locking mechanism that is simple in construction and therefore, capable of being cheaply manufactured. Furthermore, the arrangement of this mechanism is such that the engaging pawl of a self-locking window fastener may be restricted in its movement and the life of the spring which normally urges this pawl into locking position may be greatly prolonged. My device enhances the safety fea tures of such a fastener, since access to the pawl is rendered difficult to persons outside the buildin Having thus described my claim:

1. A. window fastening having in combination a plate adapted to be secured to the top of the lower sash and having an opening in it, a pawl pivoted to the plate and adapted to engage a shoulder on the upper sash, a leaf spring extending through the opening of the plate and secured between it and the top of the sash, said spring ex tending upwardly and engaging the front of the pawl, and a lever member rigidly secured to the side of the pawl and extending laterally therefrom and then downwardly and terminating in a thumb piece lying adjacent to but above the top of the sash.

2. A window fastening having in combination a rack bar adapted to be secured to the stile of the upper sash, a plate adapted invention, 1

to be secured to the top of the lower sash and overhang its junction with the upper sash and having a pair of upwardly offset cars, a pawl having an integral T-head extending loosely beneath said cars, said pawl being adapted to engage the bar. a member rigid with the pawl, said member comprising an outwardly and downwardly extending arm having the lowermost end thereof terminating in a finger pad, said pad being adapted to abut the sash to prevent motion of the pawl beyond unlocking position.

3. The combination of a toothed latch bar adapted to be secured to the upper sash of window, a pawl adapted to co-operate therewith, a plate extending across the top of the lover sash. said plate having its main portion extending across the joint between the upper and lower sash throughout, their width, and having an integral end portion constituting a support for the latch pawl, and means for securing said main portion to the sash.

4C. In a window sash fastener, the combination with ratchet-plates, of pawls adapted to co-operate therewith, a base plate extending substantially the entire width of the lower sash and overhanging the rear edge thereof, said plates being secured-to the top of said sash and supporting said pawls 'at its ends respectively, and springs adapted to force said pawls into engagement with their *atchet-plates, finger pads secured to said pawls respectively whereby they may be moved away from said plates to unlocking position said pads being positioned to prevent motion of the pawls away from the plates beyond the position in which they clear said plates.

5. In a window sash fastener, the combination of a holding device, adapted to be secured to the style of the upper sash, a plate adapted to be secured to the top of the lower sash and extending along the same and overhanging it at the rear, said plate having an integral offset portion at one end. a Theaded pawl, the shank of which extends through an opening in the offset portion of the plate and the head of which extends be heath upward ridges on said ofl'set portion.

6. A window fastening having in combination an upper and lower sash, a rack bar carried by the upper sash, a pawl pivotal] y mounted on the lower sash, a base for said pawl, said base extending along the entire length of the sash, means for normally urg ing said pawl into engagement with the rack bar and means carried by the pawl for limiting the movement thereof away from the rack bar.

7. A, window fastening having in combination an upper and lower sash, a rack bar carried by the upper-sash, a pawl pivotally mounted on the lower sash, a base for said pawl, said base extending along the entire length of the sash and across the joint betweenthe sash, a spring for normally urging said'pawl into engagement with the rack bar and means carried by the pawl for limiting the movement thereof away from the rack bar, said means comprising a. member extending outwardly and downwardly from the pawl. and terminating in a finger pad.

In testimony whereof, I hereunto alfix my signature.

ALONZO E. DAVIS. 

